Voltage Divider Calculator

📖 Frequently Asked Questions (FAQ)

1. What is a voltage divider?

A voltage divider is a simple linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). It is made using two resistors connected in series.

2. What is the formula for a voltage divider?

The output voltage is determined by the ratio of the two resistors, R1 (top) and R2 (bottom). The formula is: Vout = Vin × (R2 / (R1 + R2)).

3. What are voltage dividers used for?

They are commonly used to create reference voltages for other circuits, to read resistive sensors (like photoresistors), and to reduce a signal's voltage level to be compatible with a microcontroller's input (level shifting).

4. Can I use a voltage divider to power a motor?

No, this is not a good application. Voltage dividers are inefficient and cannot supply significant current. When a load (like a motor) draws current, the output voltage will drop significantly. They are best used for signal-level voltages, not as power supplies.